The order Araneae are divided into two suborders and the classification are determined by the structure of the chelicerae, and the number of booklungs. The suborder Mygalomorphae, or Orthognatha, got two pairs of booklungs, include 15 families – for example the trapdoor spiders in the family Ctenizidae, and Hexathelidae – funnelweb spiders, tarantulas are in the Theraposidae family.

The mygalomorphs jaws, or chelicera, are located parallel to the body and the spider must raise the front body to be able to inject the fangs into its prey. Suborder Labidognatha, or araneomorphs got one pair of booklungs, includes around 60 families, got the chelicera with the fangs go sideways. This family are the so called ”true spiders” and include many species.

Among them are those who catch the prey in a web – Araneidae.
Theridiidae, which include the widow spiders, Agelenidae – catches prey on a flat web on the ground and the hunting spiders, Lycosidae, which hunt on the ground and
Salticidae, jumping spiders, active spiders with a excellent eyesight.

Theraphosidae

At a recent inventory 900 species in 113 genera of theraphosids was counted.
We can only speculate of how many more that are yet to be discovered.